unicorn nginx sinatra
http://qiita.com/konpyu/items/3ba3774bcde226d7d07d
https://github.com/blog/517-unicorn
http://qiita.com/hiroki_y/items/06f5780543bec988d8b7
http://www.rokurofire.info/2013/11/20/sinatra_builtenv/#num7
http://xyk.hatenablog.com/entry/2014/12/06/233214http://xyk.hatenablog.com/entry/2014/12/06/233214
http://recipes.sinatrarb.com/p/deployment/nginx_proxied_to_unicorn
http://qiita.com/shinyashikis@github/items/ace49154f0c71c65b2c9
http://qiita.com/akito1986/items/56198edcafc222b320a8
http://qiita.com/a_ishidaaa/items/868e85aa6946a5760283